Add border input in the qr code component

frontend/src/app/components/qrcode/qrcode.component.html

@@ -1,4 +1,4 @@
 <div class="holder" [ngStyle]="{'width': size, 'height': size}">
   <img *ngIf="imageUrl" [src]="imageUrl">
-  <canvas #canvas></canvas>
+  <canvas #canvas [style]="{'border': border + 'px solid white'}"></canvas>
 </div>